.nav{
    width: 100%;
    height: 1.25rem;
    text-align: center;
    border-bottom: 1px solid rgb(237,237,237);
    ul{
        display: inline-block;
        li{
            float: left;
            margin: 0 0.64rem;
            padding: 0.4rem 0;
            a{
                color:rgb(136, 136, 136);
                font-size: 0.36rem;
                font-weight: 800;
            }
            a.active{
                color: rgb(68, 68, 68);
                border-bottom: 4px solid rgb(68, 68, 68);
            }
        }
    }
}